Fur - furnace



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FURNAC E Filed Aug. 25. 1927 3 Sheets-Sheet l Aug. 16, 1932. c, J HUBER I 1,871,454

FURNACE Filed Aug. 25, 1927 3 Sheets-Sheet. 5

2 unun .0111] mm nu 4mm- 68, 11mm ung nun mun --nnu 2845:2001]. 11mm an 000 mu nun mmmm Mn nun nun -unn k l unn- U ggm/ ooood\ 'ooooo\ ooooo\o furnace at the bottom of the Patented Aug. 16, 1932 UNITED. STATES PATENroFFIcE cn RLEs J. HUB R. or. BALTIMORE, MARYLAND, assrenon or ONE-HALF To FLYNN ND EIVIRICH COMPANY, OF LAND BALTIMORE, MARYLAND, A oonron 'rroiv or MARY FURNACE Application filed August 1927. Serial in). 215,280.

' The invention relates particularly to a furnacein which the coal is fed to'the forward end of the grate and moved backwardlyl'as combustion progresses. The motion may '3 i 5 be the result of the rocking of the grate bars at intervals either manually or mechanically. I In the form of stoking grate illustrated the grate is inclined and the downward and rearward inclination assists in this opera- 10 tion. Astoker of this type is fully described in my reissue Patent No. 15,124.

In the preferred type of furnace to wh1ch the invention as illustrated in the drawings a hopper and there is a coking shelf beneath the hopperextending backwardlyjinto the hopper opening, and above the grate.

' the preferred form of the furnace front, as

illustrated, there is an arch of resistive ma-' terial above the coking shelf inclined upfgre'en coal on the shelf and in contact with ward into the furnace. The coking shelf and the arch are exposed to the direct'radiation from the fire and become highly heated.

The fuel as admitted piles up on the coking shelf where it is subjected to a very high temordinarily'accomplished; by a pusher which operates beneath the hopper. The air which enters beneath and forward 'of the coking shelf passes upwardly in contact with-the thehighly heated arch, mingling with the gases from the. coke and burning them.

apparatus as illustrated in Patent No.

of the grate, which, aslshown, in the patent is preferably inclined forward end of the grate the coked fuel is fed backward, as already outlined by the 1 intermittent rocking of the Stoker ba rs.

Under the circumstances thus outlined, the

9 fuel as'itis'piled up onand about the for-' is applied, the fuel is fed automatically from V g through the fire door tothe There is also an. air opening beneath the coking shelf and forward of the rear edge of the same and 1nwardly and rearwardly and extending backthe coking shelf and .ward over'the surface of thecokingshelf,

peratureand is partially or fully coked be-. fore being fed to the grate, the feeding being In accordance with the operation ofthe ,downwa-rdly'to the rear. From the Ward end ofthe grate tends'to-roll :or flow I of it falling into the ash pitwhere it is mingledwith therefuse, ashes, clinker,-etc and being discarded therewith is wasted." Alsov the fuel thus dropped forward of the rear edge of the coking shelf is subjected to an excess of cold air and sheltered by the fuel forwardly obstructing'the air passage, part for hand stoking and for the admission of combustion .directly in front'of it from the-heat or the tools for removal of clinkers and-to clear the A 1 grate, has always been regarded as necessary and is ture. y a The-invention relates to theprovision of an upright grate at the rear edge of the coking shelf whereby the tendencyof-the fuel-to flow forwardlyand close the air prevented. The new upright grate or grating v admits air freely fromthe opening beneath permits it to pass up the fuelas fed being deflected to the rear] onto the hotter and more efficient combustion area'of the grate. This vertical grate is also arranged in sectionswhich may be rotated downwardly to give access to the fire and grate area from the fire door without releasing orlosing' the fuel which is resting'on the. sectionof the grate being moved.

In theaccompanymg drawings I have illustrated an upright grate or grating applied to the front of'a stoke'r-gr-ate and so much'of" a furnace front and rockingbar stoker as isv regarded as desirable to; show the application'and operation of the same; 4 4

In the drawings: U F'gure 1 is avertical fore and aft central section through a unit of afurnace and stoker further retained in the'present StIIlC- f opening is equipped in accordance with the invention,

the same being taken on the line 1 -Figure2.-

' .Figure Q'jis a se gction o'n the line 2 2of Figure 1Q Figure is a section on the line 55 of .p Fi ure 3.

' eferring to the drawingsfbynumerals,

eaclr of which'is used to indicate the same wardly to. the rear, as shown, and between or similar parts in'the different figures, the furnace structure, as illustrated, includesa" furnace front 1 having a coking shelf 2 spaced above which isithearch 3 inclined upf the arch. and the coking shelf is the feed opening 4 through which the fuel is fed, in. j theform of'the invention shown, from and by means of hopper 5 which may be equipped with, a pusher 6 of any. well known types a The fire door 7 closes a hand stoking opening or passage8 .which enters the furnace, be-

.neath th ei coking shelf and'at the top of the "3.95;

grate 9. The grate 9 is preferably of the stoking type. Asshown, it is composed of a rocking bars 10, as in. my reissue patent referred to. above, which may beactuated by hand lever 11 through rod 12, or in anysuitused are omitted, the notch 17 spaced well ablemanner, the bars beingpivoted at 14 jand supported on sidebars 15.

The two forward grate bars previouslybackwardly fromgthe forward :ends of the 'd 1 1 b t'll b ht H. S1 8 bms 5 and su Stan la y (meat he conveniently controlled by a toggle includrear-edge of thecoking shelf being occupied by. the trunnion 18 of the upright-grating" or grate 19, to .bedescribed. The omissionof the forward grate sections provides a free 40 and unobstructed airopening 20 at this point.

of extended area, in addition to the opening 21 forward of the grate. The fuel is.

excluded'from this opening by the upright grate or. grating 19. I r

The arch 3 may also beprovided with an air opening 22,24, which discharges just inside the feed opening 4. at the top thereof,

being mixed with the gases from thecoking fuel 25 on'the shelf as'they pass over the.

l. tact withithe heated members 2 and 3.

surface of the heated arch 3, ignitingthe fuel on the shelfand tending to complete combus:

tion produced by the .intermingling, of these combustible gases with-gthe air which enters 1 at the front of the grate, as already described; and passes with the combustible gases in con I The invention relates particularly to the provision of the upright fuel support and 1 erably upright or slightly inclined from grate member 19, separately, and in combination with other features. -This member 19 consists of a wall or support which is prefthe upright and slotted or perforated at 27. The

uprightsupport or grate 19, as shown, com

prises a stationary portion 28 connected by..

frame member 29 which may be mounted on trunnionslS projecting therefrom near the bottom at each side and fitting in the notches 17 in the side bars. These upright supporting walls or grids are providedone for each grate section 30,.31and 32,.assh'ownin Figure I2,'the trunnions 18 being, for'this purose, of alength slightly less than one-half the width of the side barsatthe notches 17 so that'the trunnions can be placed end to end, the upright grids or' supports being formed in sections 33 of the width of each grate section. The stationary portion 28 of each section ismadein an upright U shape as seenfrom'the front in Figure 3, i. e., each section is .provlded with a centraldoor openmgr-a4. closed by means of 'a swinginggrid the: bottom forwardly disposed vj ournal notches 36, it being understood that Figure 3 1s a view looking at the grid or supporting '35. j Eachsaid swinging grid is provided at wall from the front, i. 'e., from the left in Figure 1. The notches 36 enclose trunnions 1 ,40 which may to advantage be perforated at 39'for the convenient admission of air The .uprightifgr'ate structure.

The sw1ng1nggrids35, as shown, Y may be ing anv arm 41 pivotally connected at itsup-- per end' to the swinging grid 35 at 42 as by means of cars 43,-Figure 3,;and at the other end atj 44 to the upright arm 45. off'a'bell crank lever-46 which is'pivotally mounted at 47 on a bracket..48. The other. arm 49 of thebell crank projects forwardly andis provided witha handle 50; g V

In the'closed positionof the swingingfgrid ing the opposite ends of theseileverspi. e.', a straight linev drawn. from 42 to 47 giving a toggleaction andrlocking the gridv in closed: position. When the handle 5 0-.is engaged .and swung downwardly theswinging grid 35 is released and in turn swung downwardly wings 40rest on side bars 15to support the 35 the pin connecting the links 41 and 45 v i swings rearwardly beyond. the line connectabout its trunnion 37,- but thegrid moves between the wings. 3 8;so that while opening of the grid aifords ac cess to the fire through the'fire door 7- and a view ofthe inside .of the furnace, the fuel supported. by the grid in its closed-position is not releasedbut is retained between the grid andthe wings38zj. ,This makes it feasible to open the upright grid at any timeto giye access to the fire for anypurpose without releasing the fuel. The

u ri ht rid orrate rovides a convenientsupport for the fuel; giving an air opening 1 0- at the front of large area which is not closed by the fuelas fed, as the upright support holds it back of the coking shelf and in the heated combustion area. The air thus enters freely from the ash pit forwardly of the grid between the side bars 15 and passes beneath the coking shelf and through the perforations or slots 27 in the upright wall or grid which slots are never more than partially obstructed by the accumulated fuel. In this way the air comes into contact with the newly ignited fuel falling from'the coking shelf and is closely mingled with the gases in the most highly heated area, supplying an excess of oxygen to be mingled with these gases and to pass upwardly in contact with the fuel which is falling from the coking Y shelf, or about to fall therefroin.

I have thus described specifically and in detail a furnace structure and grate embodying the features of my invention in the preferred form in order that the nature and operation'ofthe same may be clearly understood, however, the specific terms herein are used descriptively rather than in' a limiting sense, the scope of the invention being defined in the claim.

What I claim asnew and desire to secure I by Letters Patent is: t

In a furnace, the combination with a coking shelf and a grate *beneaththe coking shelf, of means in the form of an upright grid section extending upwardly from the grate at a sharp angle to the grate substantially to e' allel'to the path of said swinging sectionto support the fire when the swinging section is moved downwardly.

Signed by'me at Baltimore, Maryland, this 22nd day of August, 1927.

CHARLES J.

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